Birch Plastics HDPE PCRHDHMWNT
- Product Name: Birch Plastics HDPE PCRHDHMWNT
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Birch Plastics HDPE PCRHDHMWNT is typically used in formulations when melt flow rate, density, and recycled content and processing temperature, shear rate, and moisture level must be controlled within specific ranges.
| HS Code | 951784 |
| Product | Birch Plastics HDPE PCRHDHMWNT |
| Material | High Density Polyethylene (HDPE) |
| Gradetype | Post-Consumer Recycled High Molecular Weight |
| Recycledcontent | 100% Post-Consumer |
| Color | Natural |
| Form | Pellets |
| Density | 0.955 g/cm³ |
| Meltindex | 0.05 g/10 min |
| Tensilestrengthatyield | 26 MPa |
| Elongationatbreak | 600% |
| Flexuralmodulus | 1100 MPa |
| Notchedizodimpact | 100 J/m |
| Heatdeflectiontemperature | 75 °C |
| Vicatsofteningtemperature | 125 °C |
| Shoredhardness | 65 |
| Processingmethods | Blow molding, extrusion |
As an accredited Birch Plastics HDPE PCRHDHMWNT factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Birch Plastics HDPE PCRHDHMWNT is packaged in 25 kg moisture-resistant bags, stacked on pallets for bulk industrial delivery. |
| Container Loading (20′ FCL) | Birch Plastics HDPE PCRHDHMWNT chemical loaded into a 20′ FCL container, palletized and secured for safe ocean shipment. |
| Shipping | Birch Plastics HDPE PCRHDHMWNT is a non-hazardous, solid thermoplastic resin. Ship in moisture-barrier bags, boxes, drums, or octabins on pallets. Keep dry, clean, and away from heat/UV. No UN/DOT hazmat classification. Use standard dry-van freight; avoid contamination. Secure loads, maintain temperature stability, and do not stack excessively. Include SDS upon request. |
| Storage | Store Birch Plastics HDPE PCRHDHMWNT in a cool, dry, well-ventilated area away from direct sunlight, heat, ignition sources, and strong oxidizers. Keep containers sealed, labeled, and off the floor to prevent moisture and contamination. Avoid prolonged UV exposure and excessive stacking. Use first-in, first-out rotation. Follow local regulations and the manufacturer’s safety data sheet. |
| Shelf Life | Typically indefinite when stored cool, dry, sealed, away from UV, heat, moisture, and contaminants; confirm exact shelf life with supplier. |
Birch Plastics HDPE PCRHDHMWNT is a high-molecular-weight natural post-consumer high-density polyethylene resin intended for extrusion and injection processes where melt strength, recycled content documentation and environmental stress crack resistance determine acceptance. Because the feedstock is a post-consumer fraction, downstream validation should include melt filtration efficiency, residual moisture, mixed-resin contamination and batch-to-batch melt-flow variation under ISO 1133-1:2022. The following scenarios are limited to commercially established conversion routes for high-molecular-weight HDPE; published data for this exact PCR grade in some specialty configurations is limited and must be supplemented by plant-level qualification.
In large-part extrusion blow moulding of non-food industrial containers, the material is dry-blended with a virgin HDPE homopolymer or hexene copolymer at 25–40 wt% for monolayer drums and jerrycans. The addition ratio is bounded by parison sag, pinch-off weld integrity and ESCR retention. At 35 wt% and above, ESCR testing according to ASTM D1693 Condition B in 10% Igepal CO-630 at 50°C becomes the controlling gate for lot acceptance. Recycled content claims are structured under ISO 14021:2016, while EU Packaging and Packaging Waste Directive 94/62/EC Annex II heavy metal limits remain mandatory irrespective of PCR loading. On an accumulator-head blow moulder with an 80–120 mm, 24:1–30:1 L/D single screw, the die head temperature is held at 185–210°C. Temperatures above 210°C increase oxidative gel specks from residual post-consumer contamination; below 185°C the elevated melt viscosity raises backpressure and produces parison chatter. A screen pack of 100–200 mesh (149–74 µm) is inserted before the die head; finer filtration can induce flow-induced melt fracture on the parison surface. Mould temperatures of 10–25°C and sequenced pre-blow, intermediate blow and final blow pressures of 0.4–0.8 MPa are adjusted to maintain wall-thickness distribution at the pinch-off. Pre-drying at 80°C for 2 h is required if the resin has been exposed to >60% relative humidity; moisture above 0.02% creates microporosity in the pinch-off weld. Terminal products are open-head and tight-head non-food industrial containers of 20–220 L, agricultural chemical jugs and automotive fluid bottles. UN-rated packagings must pass the design qualification tests of UN Chapter 6.5 and 49 CFR 178 before commercial use; this PCR grade is not a drop-in for UN certification without mechanical verification. Avoid blending with ethylene-vinyl acetate or acid-functional carriers without re-qualifying parison melt strength and weld integrity.
What Limits Core-Layer PCR Loading in Coextruded HDPE Geomembrane?
In coextruded HDPE geomembrane production, Birch Plastics HDPE PCRHDHMWNT is confined to the inner core layer at 20–35 wt%. The cap and extrusion weld layers remain virgin HDPE with a full antioxidant package because the PCR fraction shortens oxidative-induction time under ASTM D3895 at 200°C and lowers notched constant tensile load failure time under ASTM D5397 in 10% Igepal at 50°C. Loading above 35 wt% is generally restricted to temporary cover or secondary containment where full GRI-GM13 conformance is not specified for the finished geomembrane. The process is flat-die coextrusion on a 120 mm grooved-feed single screw with a barrier screw and 30:1 L/D; melt temperature is controlled at 200–235°C. The PCR core is dried to <0.02% moisture and passed through a continuous screen changer at 80–120 mesh (177–125 µm) before joining the virgin cap layers. Die gap is set for 1.0–2.5 mm finished thickness, with nip roll temperatures 70–95°C on the polishing stack to reduce thickness variation. Terminal products are smooth and textured geomembranes for landfill basal liners, pond liners and temporary cover. The operational boundary is antioxidant depletion: if ASTM D3895 OIT falls below 100 min for the finished laminate, the structure is not recommended for primary hazardous waste liner service. Published data for this specific PCR grade in three-layer geomembrane cap/core/edge constructions is limited; full GRI-GM13 testing per lot is mandatory rather than inferential.
| Geomembrane property | Test method | Typical virgin HDPE control | Effect of 30 wt% core PCR fraction |
|---|---|---|---|
| Oxidative-induction time at 200°C | ASTM D3895 | >100 min | Reduced, frequently below 80 min without antioxidant up-adjustment |
| Notched constant tensile load at 50°C | ASTM D5397 | >500 h at 30% yield stress | Failure time shortened; stress level must be re-anchored per lot |
| Puncture resistance of 2.0 mm sheet | ASTM D4833 | >400 N | Minor reduction if contaminant fraction is filtered below 125 µm |
| Density | ASTM D1505 | 0.940–0.955 g/cm³ | No significant shift if PCR feedstock density is pre-sorted |
Corrugated drainage pipe production using Birch Plastics HDPE PCRHDHMWNT is an established low-pressure application in which the recycled fraction is loaded in the outer corrugated wall at 30–50 wt%, while the inner liner is virgin HDPE or a carbon-black masterbatched HDPE depending on UV service. For agricultural drain tile and land drainage where long-term hydrostatic pressure is absent, a 100 wt% post-consumer compound is permissible only if ring stiffness after mandrel reversion meets the design value and the pipe is not exposed to continuous effluents above 50°C. Compliance is maintained under EN 13476-3 for structured-wall thermoplastic piping systems and AASHTO M294 or ASTM F2306 for corrugated polyethylene drainage pipe in transport infrastructure. The PCR fraction is screened at 3–5 mm before extrusion to prevent calcified fragments from breaking through the corrugation wall during vacuum forming. On a corrugated pipe line with a 65–90 mm, 30:1 L/D single screw and vacuum calibration blocks, melt temperature is held at 180–220°C. Heterogeneous PCR fractions reduce melt strength and can collapse the corrugation crests; post-die sizing vacuum of -0.04 to -0.08 MPa is maintained to hold the profile against the forming blocks. Terminal products are 100–1000 mm diameter storm culverts, agricultural drainage pipe and retention/detention laterals. The limitation is creep resistance: high recycled loading in load-bearing culvert applications must be confirmed by long-term ring-bending strain testing rather than short-term ring stiffness alone.
Injection Moulding of HMW-HDPE Pallets and Dunnage Under Flow-Length Constraints
Injection moulding of pallets and dunnage consumes Birch Plastics HDPE PCRHDHMWNT at 50–100 wt% for non-structural returnable pallets and protective dunnage. For rackable pallets requiring tensile yield above 18 MPa under ASTM D638, the blend is reduced to 30–50 wt% PCR with virgin HDPE to preserve stiffness and impact resistance. Material preparation follows ISO 17855-2:2016 for specimen conditioning and ISO 14021:2016 for recycled content declarations. The low melt index of high-molecular-weight HDPE requires generous flow paths and high injection pressure. Minimum wall thickness is 4 mm, rib base thickness is not less than 3 mm, and flow-length-to-wall-thickness ratio is kept below 150:1 to avoid short shots at the pallet edges. Processing is performed on a 1200–3000 t clamp press with barrel temperature 190–230°C, nozzle temperature 210–230°C, injection velocity 80–150 mm/s, hold pressure 50–80 MPa and screw back pressure 0.5–1.5 MPa. Hot runner manifold temperature is maintained below 230°C; higher temperatures create degradation odour and gate-vestige stress whitening from post-consumer residues. Terminal products are industrial pallets, dunnage trays and collapsible bulk boxes. The incompatibility boundary is with low-viscosity PE waxes: although waxes improve fill, they reduce ESCR and should not be compounded into structural HDPE pallet formulations without re-testing under ASTM D1693.
Closure moulding lines running Birch Plastics HDPE PCRHDHMWNT are constrained less by ESCR than by gate freeze-off, odour and seal-surface flatness. In non-food industrial closures for motor oil, agrochemicals and household chemicals, loading is held at 15–30 wt% to maintain low warpage and consistent thread diameter. Compliance is verified with ASTM D1693 ESCR and ASTM D638 tensile yield; REACH Article 33 communication applies if the PCR feedstock contains SVHC above 0.1% w/w. The injection moulding process uses a high-speed reciprocating screw with 25:1 L/D, melt temperature 200–240°C and valve-gated hot runner. Cycle time is governed by gate freeze-off; increasing melt temperature above 240°C leads to degradation odour from post-consumer residues and requires mold vent cleaning. Terminal products are tamper-evident and child-resistant caps for industrial and non-food containers. This grade is not applicable to food, beverage or pharmaceutical closures unless the feedstock is separately validated under 21 CFR 177.1520 and EU 10/2011 for olefin food-contact use.
When Sheet Extrusion Requires Flat-Die Consistency Across PCR Lots
Industrial sheet and panel applications consume Birch Plastics HDPE PCRHDHMWNT at 20–40 wt% in multi-layer sheet where the recycled core is capped with virgin HDPE for surface finish and UV resistance. Non-appearance industrial sheet may operate at 100 wt% if the melt index is managed by high-shear screw design and if specifications are limited to low-temperature impact and flexural modulus. Mechanical compliance is anchored to ISO 527-2:2012 tensile, ISO 178:2019 flexural and ISO 179-1:2010 Charpy impact. The extrusion line uses a 100–150 mm single screw with 30:1 L/D, a flat sheet die with restrictor bar, and a three-roll polishing stack. Melt temperature is 190–225°C; die lip is set for 2–12 mm thickness, and roll gap controls thickness within ±0.2 mm. Terminal products include trailer liners, chute liners, dock bumpers and industrial cutting boards. Direct food contact is excluded unless the sheet complies with FDA 21 CFR 177.1520 and EU 10/2011. Avoid blending with high-moisture fillers that generate microvoids at the roll nip and reduce flexural fatigue resistance under ISO 178 repeated loading.
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- Birch Plastics HDPE PCRHDHMWNT is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
Birch Plastics HDPE PCRHDHMWNT is a post-consumer recycled high-density polyethylene resin whose product code identifies a high-molecular-weight distribution and natural tint. The material is intended for extrusion, blow moulding, and injection moulding operations where recycled content is permitted by the end-use specification. Supplier lot certificates govern exact density, melt index, additive loading, and contaminant thresholds; published data for this specific recycled configuration is limited. Class-typical high-molecular-weight HDPE grades are tested for density under ISO 1183-1, with general values falling between 0.940 g/cm³ and 0.965 g/cm³. High-load melt index is determined at 190°C/21.6 kg using ISO 1133-1. Tensile yield and elongation measurements are commonly performed under ASTM D638-14, flexural modulus under ISO 178, and environmental stress cracking resistance under ASTM D1693 Condition B. Lot-to-lot variation in melt index, pigment type, and residual moisture should be assessed by incoming inspection using ISO 15512 moisture determination and ISO 1133-1 melt flow testing.
Compared with general-purpose recycled HDPE, the high-molecular-weight fraction in PCRHDHMWNT produces higher melt strength and greater resistance to slow crack growth, but it also raises backpressure in moulding and requires larger gate and runner dimensions. Unlike virgin HMW-HDPE, the recycled grade may contain trace polypropylene, paper fibre, or polar residues that influence dispersion and surface finish. These differences require process validation rather than direct drop-in substitution. Natural tint also differentiates the product from carbon-black-bearing recycled grades, which typically provide better ultraviolet screening but can limit colour flexibility in end-use parts.
Why Is High-Load Melt Index the Preferred Rheological Control for PCRHDHMWNT?
Because high-molecular-weight HDPE exhibits low standard melt flow at 190°C/2.16 kg, ordinary melt flow rate testing is not sufficiently reproducible for process control. High-load melt index using a 21.6 kg load is therefore measured on a melt indexer with a 2.095 mm die orifice under ISO 1133-1. Class-typical HMW-HDPE values fall between 2 g/10 min and 15 g/10 min, but the PCRHDHMWNT lot certificate is the only authoritative source for product-specific limits. Capillary rheometry at 190°C may be used to extend the data into higher shear rates when moulding thin-wall sections or small gates are required.
High-load melt index relates inversely to average molecular weight and influences melt strength, die swell, and environmental stress cracking resistance. A material with a high-load melt index near 2 g/10 min will generally produce higher die swell and better parison stability in blow moulding, but it will also generate higher screw torque and melt pressure. A value near 15 g/10 min will fill thin sections more readily but may sacrifice environmental stress cracking resistance and long-term load-bearing performance. Incoming resin should be tested before production because post-consumer feedstock can shift high-load melt index outside the expected range after stock changes or sorting adjustments.
Moisture management influences rheology. Recycled HDPE may carry surface water from washing, outdoor storage, or bale exposure. When measured by ISO 15512, moisture content above 0.05% can create surface splay and melt pressure fluctuations. Pre-drying at 80°C for 2 hours is commonly applied when ambient relative humidity exceeds 60% or when visible surface moisture is present. Drying should be confirmed by production trials because bulk density and pellet geometry affect heat transfer in hopper dryers.
In compounding and extrusion, rotational shear causes chain scission if the melt is overheated. Melt temperature should remain between 180°C and 230°C, with peak barrel settings not exceeding 250°C. Sustained residence time above 260°C accelerates oxidative gel formation. Oxidative stability can be monitored by oxidative induction time at 200°C under ISO 11357-6; values below 10 minutes indicate insufficient stabilization for repeated heat history. Every additional extrusion pass tends to increase melt index and reduce environmental stress cracking resistance, so regrind ratios should be validated by lot-specific testing.
Corrugated drainage pipe and sheet extrusion lines using single-screw extruders with 30:1 to 36:1 L/D ratios can process PCRHDHMWNT when the feed throat is adequately cooled and a grooved barrel section is used to stabilize post-consumer flake feed. Pipe dimensional checks can be conducted under ISO 3127, while sheet thickness and surface quality can be monitored by the production line’s beta gauge or contact measurement system. Non-pressure agricultural and drainage pipe applications may accept recycled content, but pressure piping requiring PE100 classification should not use this product unless lot-specific long-term hydrostatic strength data under ISO 9080 are available and the pipe manufacturer has completed qualification. Published data for this specific recycled configuration in pressure-pipe service is limited.
Large-part injection moulding of pallets, crates, and dunnage platforms uses hydraulic clamp force above 1,000 metric tonnes with shot sizes matched to a 1200 mm × 1000 mm pallet mould or larger. Injection pressures commonly range from 800 bar to 1,200 bar. Because the high-molecular-weight fraction reduces flow, the process window should compensate with lower melt temperature or higher injection speed where the machine’s hydraulic response permits. Mould shrinkage may be evaluated according to ISO 294-4 and should be measured on prototype cavities because recycled lot variation alters crystallinity and density. Shrinkage in unfilled HDPE parts typically falls between 1.5% and 3.0%, but the actual value for PCRHDHMWNT depends on cooling rate, wall thickness, and feedstock composition.
Melt Filtration and Contaminant Dispersion Limits in Recycled HMW-HDPE
Post-consumer recovered feedstock requires melt filtration to remove non-melt residue before die entry or mould filling. For single-screw extrusion of HMW recycled HDPE, a screen pack configuration such as 20/60/100/20 mesh can be used, but the pressure differential across the screen changer should be maintained below 35 bar to avoid excessive shear heating and melt-index drift. If backpressure rises from 70 bar to 150 bar within a single shift, screen replacement is required to prevent screen breakthrough or contaminant migration downstream. Automatic screen changers with breaker plates reduce downtime and maintain more stable melt pressure than manual slide-plate systems.
Common contaminants include polypropylene, polyethylene terephthalate, paper fibre, and elastomeric fragments. Polypropylene melts at lower temperature and can remain unmelted in zones that are too cold, producing hard spots in sheet and pipe. Paper fibre degrades at processing temperatures and generates carbonaceous specks. Polyethylene terephthalate does not melt in the HDPE processing window and must be removed by melt filtration. No combination of filtration and mixing can fully compensate for poorly sorted feedstock, so the supplier’s sorting and wash line configuration is a critical quality variable.
Dispersion can be improved on a co-rotating twin-screw extruder with an L/D ratio of 28:1 to 40:1 and distributive mixing elements, but excessive specific mechanical energy will generate frictional heat and reduce molecular weight. Specific mechanical energy should be recorded and monitored against melt index drift. Gel particles originating from oxidized material can be sampled by pressure-rise testing or film casting and counted visually; the method should be agreed between supplier and converter because no universal gel-count standard applies to all recycled HDPE grades.
When PCRHDHMWNT Replaces Virgin HMW-HDPE in Thick-Section Injection Moulding
Thick-section moulding exposes the viscosity difference between virgin and recycled high-molecular-weight polyethylene. Gate freeze time may shorten because the recycled melt cools faster under pressure, while the higher viscosity component raises injection pressure at thin runner sections. Moulds designed for virgin HMW-HDPE may require runner diameters to be enlarged by 10% to 20% and gate land lengths reduced to avoid short shots or jetting. Hot runner manifold temperatures should be confirmed with an in-mould pressure transducer or nozzle pressure sensor. If fill pressure exceeds 1,400 bar, moulding should stop until the gate or runner configuration is corrected.
Mechanical properties should not be assumed equal to virgin HMW-HDPE. Tensile yield strength may be lower by several percentage points due to feedstock heterogeneity, and notched impact values can show wider lot-to-lot scatter. The material should be tested under ASTM D638-14 for tensile yield and elongation, ISO 178 for flexural modulus, and ISO 180/A for notched Izod impact. Environmental stress cracking resistance under ASTM D1693 Condition B is particularly important in thick parts with moulded-in stress. Any part that must resist slow crack growth in contact with detergents, oils, or fuels should be validated with the specific chemical agent at the maximum service temperature.
Natural tint lacks carbon black, which affects outdoor service. The carbon black concentration typically found in black recycled HDPE grades acts as an ultraviolet stabilizer. Without carbon black, PCRHDHMWNT requires an ultraviolet stabilizer package if long-term outdoor exposure is expected. Accelerated weathering can be conducted under ASTM G154 or ISO 4892-3, with acceptance criteria defined by the end-use specification. Surface colour shift and loss of elongation are the primary failure indicators.
For blow moulding applications such as industrial containers and intermediate bulk packaging, the high molecular weight fraction supports parison stability, but the recycled fraction may introduce microgels that weaken pinch-off weld strength. Bottle drop testing under ASTM D2463 or equivalent internal protocol should be performed on production samples. Pinch-off weld thickness and flash configuration are machine-specific and should not be transferred between production lines without re-validation.
Compliance documentation for Birch Plastics HDPE PCRHDHMWNT must be reviewed against the end market and geographical jurisdiction. The table below lists the applicable reference matrix for recycled polyolefin materials of this class.
| Requirement | Applicable standard or directive | Test condition or threshold |
|---|---|---|
| Post-consumer recycled content claim | ISO 14021 | Supplier mass balance documentation |
| Food-contact olefin polymers | FDA 21 CFR 177.1520 | Extractables depending on end use |
| REACH SVHC restriction | EC 1907/2006 | ≤0.1% w/w per article |
| RoHS restricted substances | Directive 2011/65/EU | Pb, Hg, Cd, CrVI, PBB, PBDE |
| Moisture determination | ISO 15512 | Process target below 0.05% |
Incoming lot acceptance should include high-load melt index under ISO 1133-1, density under ISO 1183-1, moisture under ISO 15512, and oxidative induction time under ISO 11357-6. The lot certificate is mandatory because post-consumer feedstock composition cannot be assumed equivalent across collection streams, seasons, or sorting lines. A production trial on the actual extruder, injection moulding machine, or blow moulder remains the only reliable method to establish the processing window for a particular lot.
Thermoforming of natural-tinted sheet produced from PCRHDHMWNT on a shuttle press with ceramic heaters typically requires sheet surface temperatures between 140°C and 160°C before forming. Wall thickness variation should be measured with an ultrasonic gauge or contact micrometer. Because the material has no carbon black to mask colour variation, incoming granulate should be checked for lot-to-lot yellowness or grey shift using a spectrophotometer with D65/10° illuminant geometry. Published data for this specific recycled configuration in thermoformed industrial packaging is limited, and validation trials should include drop tests, stacking tests, and residual stress evaluation.
